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Your Chassis No. 2469 denotes it was the 2469 911T Targa built in 1970

The Dash No. denotes it was the 4054 911T Coupe & Targa built.
This number should match your engine No.

Each chassis style had a it own set of Serialization numbers. Engines No's were for the total number of Coupes and Targa's built in that paticular model.. T, E,& S each had their own set of chassis and engine No's.

Thus my 69 911S has Chassis No 882 while it has engine No. 1185

The 882 means it is No. 882 Coupe built and the No. 1185 911S built for 1969. Which means about the middle of the production run. Thus the following sale date makes sense and further verifys that the car is original....This information comes from my Porsche Maintenance Record that came with the car when delivered on 4/24/69 at Ogner Porsche in Canoga Park, CA.

You can make a rough determination if your engine is original by comparing the how late in the run your engine and chassis were built...if you have an early chassis No. and a late engine No. something ain't right.